Safe structure of cord set for window curtain

ABSTRACT

An improved safe structure of cord set for a window curtain includes a base, a plurality of towing cords, a shade body and a pulling cord unit. The shade body is provided for each towing cord with buckles and a connector for connecting an end of the towing cord. The connector includes a socket fixed on the shade body, an insertion connecting member connected with the socket for fixing an end of the towing cords, the insertion connecting member has a blind hole for placing therein an end segment of the towing cords, thereby blocking of the end segment in the buckle is prevented when the connecting member is released from the socket, the buckle has thereon a breaking slit, thereby the towing cord can be loosened and released from the buckle when it is exerted with an axial pulling force over a predetermined value.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a technique concerning the structure of a window curtain, and especially to an improved safe structure of a cord set for a window curtain.

2. Description of the Prior Art

There are many kinds of curtains for decoration, covering, obscuring etc., for instance, they include Roman shades, roller shades etc. to be widely used in houses.

Curtains normally need to be provided with cord sets for the convenience of operation of contracting/stretching them. Taking a Roman shade as an example, it includes a base, a plurality of towing cords pending below the base, a shade body provided below the base to be controlled by the towing cord, a pulling cord unit extending out of the base to connect with the towing cord to manipulate the actions of contracting/stretching the cord.

The above mentioned towing cord, pulling cord unit etc. are most possible to induce a dangerous accident such as a curious child has his neck tied tight or his limbs wound, many countries and districts in the world forcedly stipulated one after one that design of cord sets must be able to avoid occurrence of accidents for the purpose of preventing the accidents such as a cord set of a curtain ties a neck or a limb of a child tight to result a danger of suffocating or hurt.

Therefore, the inventor studied and designed the present invention according to the requirement of a safe structural concerning the towing cords on a window curtain to provide safety in use of the window curtain.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide an improved safe structure of a cord set for a window curtain, in order that when a cord set of a curtain is wound around the neck or a limb of a child inadvertently, the structure can fast and effectively relieve the tension of the cord set, so that the child can get rid of the binding force of the cord set or the binding force of the cord set can be lowered, and the danger that the child suffocates or his limb gets hurt can be avoided.

In the improved safe structure of cord set for a window curtain of the present invention, the so called curtain includes a base, a plurality of towing cords pending below the base, a shade body provided below the base to be controlled by the towing cords to manipulate the actions of contracting/stretching; a pulling cord unit extending out of the base to connect with the towing cords to allow a user to manipulate the actions of contracting/stretching with the towing cords. The shade body is provided for each towing cord with a plurality of buckles for extending therethrough of the towing cord and with a connector for connecting an end of the towing cord. The connector includes a socket fixed on the shade body, an insertion connecting member insertion connected with the socket; the caliber of each of the buckles can allow extending of the insertion connecting member therethrough; the socket is provided with a jack which is provided on its two inner lateral sides with at least a pair of mutually symmetrical grooves; the front end of the insertion connecting member is a V shaped plug, while the rear end of the latter is a connecting portion for connecting the cord set. The V shaped plug is provided in its middle with a spare slit for compression, and is provided on its two lateral sides with curved protruding portions in correspondence with the grooves; the tailing end of the connecting portion for connecting the cord set is provided with a guide hole for extending of the towing cord therethrough; a blind hole is in communication with the guide hole to make an end segment of the towing cord not protruding out of the surface of the connecting portion when being placed in the blind hole, in order that the insertion connecting member is released from the socket when the towing cord is exerted with an axial pulling force over a predetermined value, and in order that an end segment of the towing cord is prevented from protruding out of the surface of the connecting portion to block the buckle. The buckle is provided thereon with a breaking slit having a width smaller than that of the diameter of the towing cord; thereby the towing cord can be released from the buckle when it is exerted with an axial pulling force over a predetermined value an axial pulling force over a predetermined value.

The present invention will be apparent in its technical means after reading the detailed description of the preferred embodiment thereof in reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing the appearance of a first embodiment of the present invention;

FIG. 2 is a schematic view showing an enlarged part of the first embodiment of the present invention;

FIG. 3 is a side view of a connector of the first embodiment of the present invention;

FIG. 4 is a perspective view showing the appearance of an insertion connecting member of the first embodiment of the present invention;

FIG. 5 is a schematic view showing the towing cord is released from the buckle of the first embodiment of the present invention;

FIG. 6 is a schematic view showing a connector of a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1 and 2 which are respectively a perspective view of the appearance of and a schematic view showing an enlarged part of a first embodiment of the present invention, the drawings are depicted that the curtain of the present invention includes a base 10, a plurality of towing cords 20 pending below the base 10, a shade body 30 provided below the base 10 to be controlled by the towing cords 20 to manipulate the actions of contracting/stretching; a pulling cord unit 40 extending out of the base 10 to connect with the towing cords 20 to allow a user to manipulate the actions of contracting/stretching with the towing cords 20. The shade body 30 is provided for each towing cord 20 with a plurality of buckles 50 for extending therethrough of the towing cord 20 and with a connector 60 for connecting an end of the towing cord 20.

Referring to FIGS. 2 and 3, wherein FIG. 3 is a side view of a connector 60 of the first embodiment of the present invention, the connector 60 includes a socket 61 fixed on the shade body 30, an insertion connecting member 62 insertion connected with the socket 61; the caliber of each of the buckles 50 can allow extending of the insertion connecting member 62 therethrough; the socket 61 is provided with a jack 611 which is provided on its two inner lateral sides with at least a pair of mutually symmetrical grooves 612.

Referring to FIGS. 3 and 4, wherein FIG. 4 is a perspective view showing the appearance of the insertion connecting member 62 of the first embodiment of the present invention; the front end of the insertion connecting member 62 is a V shaped plug 621, while the rear end of the latter is a connecting portion 622 for connecting the cord set.

The V shaped plug 621 is provided in its middle with a spare slit 623 for compression, and is provided on its two lateral sides with curved protruding portions 624 in correspondence with the grooves 612; the tailing end of the connecting portion 622 for connecting the cord set is provided with a guide hole 625 for extending of the towing cord 20 therethrough; a blind hole 626 is in communication with the guide hole 625 to make an end segment of the towing cord 20 not protruding out of the surface of the connecting portion 622 when being placed in the blind hole 626, in order that the insertion connecting member 622 is released from the socket 61 when the towing cord 20 is exerted with an axial pulling force over a predetermined value, and in order that the end segment of the towing cord is prevented from protruding out of the surface of the connecting portion 622 to block the buckle 50.

Referring to FIG. 5 which is a schematic view showing that the towing cord is released from the buckle 50 of the first embodiment of the present invention, the buckle 50 is provided thereon with a breaking slit 51 having a width smaller than that of the diameter of the towing cord 20, thereby the towing cord 20 can be released from the buckle 50 when it is exerted with an axial pulling force over a predetermined value; wherein the buckle 50 is in a “D” shape, and the breaking slit 51 is extended from a central position on the inner curved side of the buckle 50 obliquely to a non-central position on the outer curved side of the buckle 50, in order that the towing cord 20 can be prevented from being released from the buckle 50 inadvertently in normal operation.

FIG. 6 is a schematic view showing a connector of a second embodiment of the present invention, this embodiment is a variation of the first embodiment, and discloses mainly a different technical means to release the connector from a pressure; in this embodiment, a spare slit 623 for compression provided in the middle of a V shaped plug 621 is longer than that of the first embodiment, thereby the pulling force needed for releasing the V shaped plug 621 out of a jack 611 can be changed.

And more, the jack 611 is provided on its two inner lateral sides with two sets of mutually symmetrical grooves 612, the calibers of the two sets of mutually symmetrical grooves 612 are different, so that when curved protruding portions 624 on the two lateral sides of the V shaped plug 621 are engaged in one set of the grooves 612, a combining force is provided, different set of grooves 612 provides different combining forces, so that a user can choose by himself an appropriate set of grooves 612 for engaging in of the curved protruding portions 624 in order to have different pulling forces to make releasing of the V shaped plug 621 from a jack 611.

The embodiment depicted and stated above is only for illustrating preferred embodiments of the present invention, and not for giving any limitation to the scope of the present invention. It will be apparent to those skilled in this art that various equivalent modifications or changes without departing from the spirit of this invention shall also fall within the scope of the appended claims. 

1. An improved safe structure of cord set for a window curtain, said curtain includes a base, a plurality of towing cords pending below said base, a shade body provided below said base to be controlled by said towing cords to manipulate actions of contracting/stretching, a pulling cord unit extending out of said base to connect with said towing cords to allow a user to manipulate said actions of contracting/stretching with said towing cords; said shade body is provided for each of said towing cords with a plurality of buckles for extending therethrough of said towing cord and with a connector for connecting an end of said towing cord; said improved safe structure of cord set is characterized in that: said connector includes a socket fixed on said shade body, an insertion connecting member insertion connected with said socket, caliber of each of said buckles allows extending of said insertion connecting member therethrough; said socket is provided with a jack which is provided on its two inner lateral sides with at least a pair of mutually symmetrical grooves; a front end of said insertion connecting member is a V shaped plug, while a rear end of said insertion connecting member is a connecting portion for connecting said cord set; said V shaped plug is provided in its middle with a spare slit for compression, and is provided on its two lateral sides with curved protruding portions in correspondence with said grooves; a tailing end of said connecting portion for connecting said cord set is provided with a guide hole for extending of said towing cord therethrough; a blind hole is in communication with said guide hole to make an end segment of said towing cord not protruding out of the surface of said connecting portion when being placed in said blind hole, in order that said insertion connecting member is released from said socket when said towing cord is exerted with an axial pulling force over a predetermined value, and in order that said end segment of said towing cord is prevented from protruding out of said surface of said connecting portion to block said buckle; said buckle is provided thereon with a breaking slit having a width smaller than that of a diameter of said towing cord, thereby said towing cord is released from said buckle when it is exerted with said axial pulling force over a predetermined value.
 2. The improved safe structure of cord set for a window curtain as in claim 1, wherein: said buckle is in a “D” shape, and said breaking slit is extended from a central position on an inner curved side of said buckle obliquely to a non-central position on an outer curved side of buckle.
 3. The improved safe structure of cord set for a window curtain as in claim 1, wherein: said jack is provided on its two inner lateral sides with two sets of mutually symmetrical grooves, said calibers of said two sets of mutually symmetrical grooves are different, so that when said curved protruding portions on said two lateral sides of said V shaped plug are engaged in one set of said grooves, a combining force is provided, different set of grooves provides different combining forces. 